/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.hop.core;

import org.apache.hop.core.row.IRowMeta;

import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.TimeUnit;

/**
 * Contains a buffer of rows. Getting rows from the buffer or putting rows in the buffer is
 * synchronized to allow concurrent use of multiple Threads.
 */
public class BlockingRowSet extends BaseRowSet implements Comparable<IRowSet>, IRowSet {
  private BlockingQueue<Object[]> queArray;

  private int timeoutPut;
  private int timeoutGet;

  /**
   * Create new non-blocking-queue with maxSize capacity.
   *
   * @param maxSize
   */
  public BlockingRowSet(int maxSize) {
    super();

    // create an empty queue
    queArray = new ArrayBlockingQueue<>(maxSize, false);

    timeoutGet =
        Const.toInt(System.getProperty(Const.HOP_ROWSET_GET_TIMEOUT), Const.TIMEOUT_GET_MILLIS);
    timeoutPut =
        Const.toInt(System.getProperty(Const.HOP_ROWSET_PUT_TIMEOUT), Const.TIMEOUT_PUT_MILLIS);
  }

  /*
   * (non-Javadoc)
   *
   * @see org.apache.hop.core.RowSetInterface#putRow(org.apache.hop.core.row.IRowMeta, java.lang.Object[])
   */
  @Override
  public boolean putRow(IRowMeta rowMeta, Object[] rowData) {
    return putRowWait(rowMeta, rowData, timeoutPut, TimeUnit.MILLISECONDS);
  }

  /*
   * (non-Javadoc)
   *
   * @see org.apache.hop.core.RowSetInterface#putRowWait(org.apache.hop.core.row.IRowMeta, java.lang.Object[],
   * long, java.util.concurrent.TimeUnit)
   */
  @Override
  public boolean putRowWait(IRowMeta rowMeta, Object[] rowData, long time, TimeUnit tu) {
    this.rowMeta = rowMeta;
    try {

      return queArray.offer(rowData, time, tu);
    } catch (InterruptedException | NullPointerException e) {
      return false;
    }
  }

  // default getRow with wait time = 100ms
  //
  /*
   * (non-Javadoc) System.getProperty("HOP_ROWSET_PUT_TIMEOUT")
   *
   * @see org.apache.hop.core.RowSetInterface#getRow()
   */
  @Override
  public Object[] getRow() {
    return getRowWait(timeoutGet, TimeUnit.MILLISECONDS);
  }

  /*
   * (non-Javadoc)
   *
   * @see org.apache.hop.core.RowSetInterface#getRowImmediate()
   */
  @Override
  public Object[] getRowImmediate() {

    return queArray.poll();
  }

  /*
   * (non-Javadoc)
   *
   * @see org.apache.hop.core.RowSetInterface#getRowWait(long, java.util.concurrent.TimeUnit)
   */
  @Override
  public Object[] getRowWait(long timeout, TimeUnit tu) {

    try {
      return queArray.poll(timeout, tu);
    } catch (InterruptedException e) {
      return null;
    }
  }

  @Override
  public int size() {
    return queArray.size();
  }

  @Override
  public void clear() {
    queArray.clear();
    done.set(false);
  }
}
